org.activiti.rest.api.repository.BaseModelSourceResource.java Source code

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Here is the source code for org.activiti.rest.api.repository.BaseModelSourceResource.java

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/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.activiti.rest.api.repository;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.List;

import org.activiti.engine.ActivitiException;
import org.activiti.engine.ActivitiIllegalArgumentException;
import org.activiti.engine.repository.Model;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.io.IOUtils;
import org.restlet.data.MediaType;
import org.restlet.data.Status;
import org.restlet.ext.fileupload.RestletFileUpload;
import org.restlet.representation.InputRepresentation;
import org.restlet.representation.Representation;
import org.restlet.resource.Get;
import org.restlet.resource.Put;
import org.restlet.resource.ResourceException;

/**
 * @author Frederik Heremans
 */
public abstract class BaseModelSourceResource extends BaseModelResource {

    @Get
    public InputRepresentation getModelSource() {
        if (authenticate() == false)
            return null;

        Model model = getModelFromRequest();

        return getModelStream(model);
    }

    @Put
    public InputRepresentation setModelSource(Representation representation) {
        if (authenticate() == false)
            return null;

        Model model = getModelFromRequest();

        if (!MediaType.MULTIPART_FORM_DATA.isCompatible(representation.getMediaType())) {
            throw new ResourceException(Status.CLIENT_ERROR_UNSUPPORTED_MEDIA_TYPE.getCode(),
                    "The request should be of type 'multipart/form-data'.", null, null);
        }

        RestletFileUpload upload = new RestletFileUpload(new DiskFileItemFactory());
        try {
            FileItem uploadItem = null;
            List<FileItem> items = upload.parseRepresentation(representation);
            for (FileItem fileItem : items) {
                uploadItem = fileItem;
            }
            if (uploadItem == null) {
                throw new ActivitiIllegalArgumentException("No file content was found in request body.");
            }

            int size = ((Long) uploadItem.getSize()).intValue();

            // Copy file-body in a bytearray as the engine requires this
            ByteArrayOutputStream bytesOutput = new ByteArrayOutputStream(size);
            IOUtils.copy(uploadItem.getInputStream(), bytesOutput);

            byte[] byteArray = bytesOutput.toByteArray();
            setModelSource(model, byteArray);

            return new InputRepresentation(new ByteArrayInputStream(byteArray), MediaType.APPLICATION_OCTET_STREAM);

        } catch (FileUploadException e) {
            throw new ActivitiException("Error with uploaded file: " + e.getMessage(), e);
        } catch (IOException e) {
            throw new ActivitiException("Error while reading uploaded file: " + e.getMessage(), e);
        }
    }

    protected abstract void setModelSource(Model model, byte[] byteArray);

    protected abstract InputRepresentation getModelStream(Model model);

}